It would accept web application vulnerabilities such as Cross Site Scripting and Cross-site request forgeries, authentication issues, remote code execution, and authorisation problems within Etsy.com, the site’s application programming interface, and its mobile application.

“This means please do not test for: spam, social engineering, or denial of service vulnerabilities,” it said in a statement.

“You also must not disrupt any service or compromise anyone’s data.”

It said bug bounties were “industry best practice”.

The bug bounty program follows the company's publication of responsible disclosure policies in April that eliminated fear of legal action in response to unauthorised security tests and encouraged researchers to report vulnerabilities.

Those who previously reported flaws will be paid under the new program.

Etsy is the latest in a string of companies including Google, Mozilla, Facebook and Samsung prepared to shell out for privately-disclosed vulnerabilities.

PayPal began offering a similar option in June after the company’s chief security officer Michael Barrett changed his tune on paying for vulnerabilities.

It paid $50,000 for a "partial Chrome exploit", which requires the use of bugs in third-party software.

But Microsoft considers bug bounties superfluous. Its security response centre was inundated with free vulnerability reports from researchers looking for fame, not fortune. Up to 80 percent of Microsoft vulnerabilities were privately and freely reported.

Redmond has instead chosen to pay up to $20,000 under its BlueHat competition to researchers who create defensive technologies which block a class of exploits.

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